Scroll-Driven Fade In Animation CSS (Code Snippet)

<div class="spacer">
  <p>Scroll down to see the magic ↓</p>
</div>
<div class="reveal-card">
  <h2>Hello There</h2>
  <p>I fade in as I enter the viewport.</p>
</div>
<div class="reveal-card">
  <h2>Smooth Entry</h2>
  <p>No JavaScript required.</p>
</div>
<div class="reveal-card">
  <h2>Native Performance</h2>
  <p>Running on the compositor thread.</p>
</div>
<div class="spacer"></div>

* {
  box-sizing: border-box;
}
body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background: #f8fafc;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 50vh; /* Spacing to force scrolling */
}
.spacer {
  height: 50vh;
  display: flex;
  align-items: center;
  color: #64748b;
}
.reveal-card {
  background: white;
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 500px;
  text-align: center;
  
  /* The Animation Magic */
  opacity: 0;
  scale: 0.8;
  animation: fade-in linear forwards;
  animation-timeline: view();
  animation-range: entry 10% cover 30%;
}
@keyframes fade-in {
  to {
    opacity: 1;
    scale: 1;
  }
}
h2 { margin-top: 0; color: #1e293b; }
p { color: #64748b; }

Scroll-Driven Fade In Animation CSS

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